For some reason email send to a domain on your server with no email address does not exept the email?

If this is true, than the message "Recipient address rejected: User unknown in local recipient table" is correct, as there is no email address... or .. am I wrong thinking this?

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If I have the domain abc.tld and the domain xyz.tld and for example abc.tld does not have any email address then also [email protected] would not work anymore.
As soon as abc.tld has one email address [email protected] will work normaly.